JS Built-ins
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SymbolhasInstancebeginner

Symbol.hasInstance — standard instanceof still works

📖 Usage Example
[] instanceof Array     // → true
({}) instanceof Object  // → true

The standard instanceof operator uses Symbol.hasInstance internally on the right-hand operand.

Standard instanceof

Even without customisation, [] instanceof Array still works normally.

Challenge: Verify the standard instanceof behaviour.

💡 Hints (1)
  • • instanceof uses Symbol.hasInstance internally on the right-hand side.